Here is one solution
Instead of heating your whole house with central heating heat the room you are in with a paraffin heater. Use your multi fuel stove in one room use a paraffin heater in your other rooms.
Bartoline Premium Paraffin is a clean burning, low sulphur, high smoke point liquid fuel refined to BS2869.C1 and maybe used in all appliances recommended by original heater equipment manufacturers.
Premium Paraffin is a low sulphur Kerosene C1 grade product, which is used as a liquid fuel for use in a wide range of applications. Used by both domestic and commercial customers. Premium Paraffin is a clean burning oil that can maintain constant high temperatures for long periods of time. Suitable for room heaters requiring a fuel that meets BS2869.C1. Always read the manufacturer’s instructions.
Paraffin running costs at my wholesale prices are 17p per kwh . Electric is 34p per kwh. 5 kg Gas bottles 39p per kwh. These are todays prices and do not include standing charges. Typical manufacturer of paraffin heaters For prices and information.